MoM Sheoldred didn't sacrifice creature upon entering battlefield
Was playing an Alchemy match, and played MoM Sheoldred. Upon entering the battlefield, opponent had Elesh Norn, Mother of Machines and Hurkyl's Prodigy on the field, as well as 3 powerstones, Relic of Legends, Mightstone and Weakstone, and Honored Heirloom. Everything was tapped out for them. Shelly played - no sacrificing of any creature.
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[Deleted User] commented
You said it: your opponent has the Mother of Machines on his side. Hence Sheoldred doesn't get an ETB trigger.